Siemens SINUMERIK 840C - Manual (Page 1008)

12.93 12 Functional Descriptions
12.21.2 Handwheel for simultaneous axes in automatic mode
Please refer to the NC Programming Guide for the SINUMERIK 840C for
information regarding programming of the HANDWHEEL OVERLAY OF
SIMULTANEOUS AXES IN AUTOMATIC MODE function.
Starting up the function
An option bit is not required for the function. It is merely necessary to specify the connected
handwheels in NC MD 5004. The handwheel to be used must then be activated via DB32
DWk+1. It is permissible for both handwheels to be active simultaneously in one block.
The weighting factor (applicable to both handwheels) is defined by setting data 564*.
Setting data 564*
Bit0=1: 1 increment per handwheel pulse
Bit1=1: 10 increments per handwheel pulse
Bit2=1: 100 increments per handwheel pulse
Bit3=1: 1000 increments per handwheel pulse
Bit4=1: 10000 increments per handwheel pulse
Only one weighting bit may be set!
A monitoring function, which is dependent on the display resolution and the handwheel pulse
evaluation, is activated to ensure that the path to be traversed with one handwheel pulse does
not exceed 1 mm and is not less than the input resolution.
Note:
The weighting factor can be displayed via the LEDs of the increment keys on the machine
control panel of the PLC.
Deletion of distance-to-go with simultaneous axes
The command @736 makes it possible to delete the distance to go on an axis-specific basis
within an NC block as a function of a signal change at an external input. The two measuring
inputs of the Central Service Board or the 16 digital inputs of the mixed I/O module (max. 2
permitted per SINUMERIK 840C) can be used as external inputs. When @736 is programmed,
the corresponding input signal is interrogated by the NC cyclically in the interpolation cycle
and, in the case of an active signal level, initiates deletion of distance to go. The input signal
must remain at the active level for at least two IPO cycles.
If several input signals are to act on one axis, then it must be ensured that all inputs are set to
the same input byte of the mixed I/O module.
An incremental axis position, which is programmed after the block with the "Delete distance-to-
go", refers to the position of the point of interruption defined by the occurrence of the external
signal.
Please refer to the NC Programming Guide for the SINUMERIK 840C for
information regarding programming of the DELETION OF DISTANCE-TO-
GO WITH SIMULTANEOUS AXES (@736) function.
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 12–233
SINUMERIK 840C (IA)